Description
差分延迟线DDL
当两个正交偏振态信号以不同的速度通过一个系统时将产生偏振模式色散(PMD),限制高速网络的最大信号传输率。差分偏振延迟线(DDL)的工作原理是将输入信号分割成两个偏振态,动态地改变两个偏振态之间的相对延迟,然后再将它们重新组合成新的偏振态输出光纤。正交偏振态之间的相位延迟是通过线性位移台进行精确控制,控制精度可达3 fs的分辨率。正交偏振态之间的最大延迟量可达±50 ps,是高速网络系统研究开发的理想选择。
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